The Spring, 1996 volume of the Journal of Cognitive Psychotherapy is a Special Issue on Morbid Jealousy which contains a series of five articles which present several different approaches to CBT with jealousy and some relevant empirical findings. Unfortunately, the articles cover a lot more than I can summarize in the time I have available so I'd recommend checking to see if any university libraries near you have this journal. (At many universities you don't need to have library privileges to read books and journals in the library or to xerox them).

You also may be able to purchase back issues of the journal from Springer Publishing Co. (212-431-4370). The issue on jealousy is Volume 10, Number 1.